Bible Dictionary · B
Boil
(rendered “botch” in Deut 28:27, Deut 28:35), an aggravated ulcer, as in the case of Hezekiah (2 Kgs 20:7; Isa 38:21) or of the Egyptians (Ex 9:9, Ex 9:10, Ex 9:11; Deut 28:27, Deut 28:35). It designates the disease of Job (Job 2:7), which was probably the black leprosy.
From Easton’s Bible Dictionary (1897), by Matthew George Easton.